The total number of tones being 16 separated by a frequency offset (FO) equal to the baud rate, each set has 8 interleaved tones separated by 2 DF: O O ...J1O O ...J2Note : in fact, 18 tones (2 x 9) are used to limit the rotations.A character is composed of 2 symbols of 3 bits each, each symbol being sent on a tone set (first symbol on J1 then second symbol on J2).

Reception mode : sensible to the side (USB or LSB), USB is recommendedCharacter set : 62 characters (lower case, numbers and some punctuation) + an error reset character (6 bits long characters) + a synchronization characterShape of pulse : rectangularSpace between tones : 10.766 HzBandwidth : 213 Hz,Demodulation : non-coherent,Synchronization : for the 3 bits symbols, using the signal. For the symbol order, thanks to a block of 4 synchronization characters sent after 12 characters standard.Convolution code : noInterleaving : noOffset tolerance : 65 Hz. This is the big advantage of this IFK mode which can accomodate a mistuning inferior or equal to +/- 65 Hz.Drift tolerance : 20 Hz/mn (depending on signal the signal-to-noise ratio)Note : inside the band limited by the offset tolerance, the drift tolerance is superior to 200 Hz/mnPmean/Ppeak : 1Lowest S/N : -12 dB.

Just another scheme to keep bandwidth down.And speed up for given bandwidth

eQSL checkt to see if you have any eQSL cards!

LotW

Club LogI upload logs on the 1st and the 15th

MP3 Player requires JavaScript and the latest Flash player. Get Flash here.